Maekawa, Hiroshi, Mutsumi Sakurada, Hajime Orita, and Koichi Sato. “Signet-Ring Cell Carcinoma Co-Existing With Adenocarcinoma of the Ampulla of Vater. A Case Report”. JOP. Journal of the Pancreas 12, no. 2 (March 9, 2011): 162–166. Accessed April 20, 2025. https://serena.sharepress.it/index.php/jop/article/view/3347.